CN103166847A - Method and device for ensuring graceful restart - Google Patents
Method and device for ensuring graceful restart Download PDFInfo
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- CN103166847A CN103166847A CN2011104070847A CN201110407084A CN103166847A CN 103166847 A CN103166847 A CN 103166847A CN 2011104070847 A CN2011104070847 A CN 2011104070847A CN 201110407084 A CN201110407084 A CN 201110407084A CN 103166847 A CN103166847 A CN 103166847A
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Abstract
The invention discloses a method for ensuring graceful restart. The method is applied to a distributed type network device which comprises a main control card and at least one wire card. The method comprises the following steps: A, termly generating a graceful restart message by a routing protocol which is in operation on the main control card, and sending the graceful restart message to the wire cards through a graceful restart agent module on the main control card, wherein the graceful restart message is sent to a neighbor device; B, receiving the graceful restart message coming from the main control card through graceful restart agent modules on the wire cards, and locally storing a current newest graceful restart message; and C, when the wire cards receive a restarting message of the main control card, sending the locally stored newest graceful restart message to the neighbor device by the graceful restart agent modules on the wire cards. The invention further discloses a device for ensuring the graceful restart. According to the method and the device for ensuring the graceful restart, the sending time of the graceful restart message can be shortened.
Description
Technical field
The present invention relates to the Graceful Restart technical field of distributed network equipment, relate in particular to the method and apparatus that guarantees Graceful Restart.
Background technology
The route switching network equipment is being born the important process such as the forwarding of network traffics and routing forwarding in Internet Interconnection.For high reliability and the forwarding performance that guarantees the route switching network equipment, usually adopt main control card to add distributed ply-yarn drill technology.Distributed ply-yarn drill is responsible for data retransmission, can improve data forwarding performance.Main control card is in charge of whole system, operation Routing Protocol etc.
Graceful Restart (Graceful Restart is called for short GR) technology belongs to a kind of of reliability engineering, is widely used on the route switching network equipment, can guarantee that when Routing Protocol is restarted data normally forward, thereby the assured forwarding business is not interrupted.At present, relatively Routing Protocol commonly used is dynamic routing protocol, as open type shortest path priority protocol (Open Shortest Path First, be called for short OSPF), intermediate system to intermediate syst (Intermediate System-to-Intermediate System is called for short IS-IS) etc.When the main control card fault is restarted; route oscillation occurs and cause forwarding service to interrupt for fear of neighbor device; requirement according to route agreement on main control card; Routing Protocol needs in time to send the GR message to all neighbor devices; allow neighbor device know main control card and restart, make the neighborhood of the route switching network equipment and route keep within a certain period of time stablizing and keep a long keep-alive time.
In prior art, as shown in Figure 4, include the Routing Protocol module on main control card, the GR message be restart after being broken down by main control card complete and the normal operation of Routing Protocol after, just produced by the requirement according to Routing Protocol of the Routing Protocol module of main control card, and directly send to neighbor device;
When overlong time that main control card restarting process and Routing Protocol put into operation, can cause GR message transmitting time excessively late, neighbor device can't in time be known main control card and restarts, thereby causes neighbor device route oscillation to occur and the problem that causes forwarding service to interrupt.
Summary of the invention
In view of this, the present invention proposes a kind of method that guarantees Graceful Restart, can shorten sending the time of Graceful Restart message.
The present invention also proposes a kind of equipment that guarantees Graceful Restart, can shorten sending the time of Graceful Restart message.
For achieving the above object, the technical scheme of the embodiment of the present invention is achieved in that
A kind of method that guarantees Graceful Restart is applied on distributed network equipment, and the described network equipment comprises main control card and at least one ply-yarn drill, comprises the following steps:
A. the Routing Protocol that moves on main control card regularly produces the Graceful Restart message that sends to neighbor device, sends on each ply-yarn drill by the Graceful Restart proxy module on main control card;
B. the Graceful Restart proxy module on each ply-yarn drill receives the Graceful Restart message from main control card, and preserves current up-to-date Graceful Restart message in this locality;
C. each ply-yarn drill is when receiving the notice that main control card restarts, and the up-to-date Graceful Restart message that the Graceful Restart proxy module on ply-yarn drill is preserved this locality is sent to described neighbor device.
A kind of equipment that guarantees Graceful Restart comprises: include main control card and at least one ply-yarn drill of at least one Routing Protocol module, described main control card also comprises the Graceful Restart proxy module, and described ply-yarn drill also comprises the Graceful Restart proxy module,
At least one Routing Protocol module of described main control card is used for the Graceful Restart message that regularly generation sends to this Routing Protocol of neighbor device;
Graceful Restart proxy module in described main control card is used for the Graceful Restart message that each Routing Protocol module produces is sent to the Graceful Restart proxy module of each ply-yarn drill;
Graceful Restart proxy module in described ply-yarn drill is used for receiving the Graceful Restart message from main control card, and preserves current up-to-date Graceful Restart message in this locality; And be used for when the place ply-yarn drill receives the notice that main control card restarts, the up-to-date Graceful Restart message of this locality preservation is sent to described neighbor device.
Beneficial effect of the present invention is, by operation Graceful Restart proxy module on main control card, the Graceful Restart message is regularly sent to ply-yarn drill, break down when restarting at main control card, replace main control card directly to send the Graceful Restart message to neighbor device by ply-yarn drill, can shorten sending the time of Graceful Restart message, improve the success rate of the Graceful Restart of distributed network equipment, can guarantee that when Routing Protocol is restarted data normally forward, thereby the assured forwarding business is not interrupted.
Description of drawings
Fig. 1 is the equipment structure chart of the embodiment of the present invention;
Fig. 2 is the method flow diagram of the embodiment of the present invention;
Fig. 3 is the Agent ID structural representation of the embodiment of the present invention;
Fig. 4 is the system configuration schematic diagram that in prior art, the Graceful Restart message sends.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below by specific embodiment and referring to accompanying drawing, the present invention is described in detail.
In the present invention, under the main control card normal operation, regularly Routing Protocol is produced by main control card, need to be issued on ply-yarn drill to the Graceful Restart message that all neighbor devices send, main control card breaks down in the time of need to restarting, and sends the Graceful Restart message by ply-yarn drill to neighbor device.When in distributed network equipment, main control card is restarted, ply-yarn drill need not to wait for that main control card starts and moves Routing Protocol, ply-yarn drill directly sends the Graceful Restart message to neighbor device, has shortened sending the time of Graceful Restart message, can improve the success rate of distributed network equipment Graceful Restart.
Routing Protocol in prior art on main control card only can just produce the Graceful Restart message and directly send to neighbor device after the main control card fault is restarted, Routing Protocol in the present invention on main control card be break down restart before, just will send to the Graceful Restart message of neighbor device regularly to generate in advance, issue ply-yarn drill, send the Graceful Restart message to neighbor device by ply-yarn drill.
The device structure of the embodiment of the present invention as shown in Figure 1, a kind of equipment that guarantees Graceful Restart comprises: include main control card and at least one ply-yarn drill of at least one Routing Protocol module, described main control card also comprises the Graceful Restart proxy module, described ply-yarn drill also comprises the Graceful Restart proxy module
At least one Routing Protocol module of described main control card is used for the Graceful Restart message that regularly generation sends to this Routing Protocol of neighbor device;
Graceful Restart proxy module in described main control card is used for the Graceful Restart message that each Routing Protocol module produces is sent to the Graceful Restart proxy module of each ply-yarn drill;
Graceful Restart proxy module in described ply-yarn drill is used for receiving the Graceful Restart message from main control card, and preserves current up-to-date Graceful Restart message in this locality; And be used for when the place ply-yarn drill receives the notice that main control card restarts, the up-to-date Graceful Restart message of this locality preservation is sent to described neighbor device.
As preferred embodiment, the Graceful Restart proxy module in described main control card comprises:
The Agent ID generation unit be used for to receive that on main control card, arbitrary Routing Protocol module is the request of the total interface application assignment agent ID of this Routing Protocol of operation, and returns to the Agent ID that distributes to corresponding Routing Protocol module; The request of described application assignment agent ID has comprised the interface ID that moves this Routing Protocol;
The message repeating unit is used for the regular Graceful Restart message that produces of arbitrary Routing Protocol module of main control card is sent to the Graceful Restart proxy module of described ply-yarn drill; The Agent ID that also has corresponding transmission interface and the interface ID that send simultaneously with the Graceful Restart message.
Graceful Restart proxy module in described ply-yarn drill is used for, and regularly receives corresponding Agent ID, interface ID and the Graceful Restart message of transmission interface of the Graceful Restart proxy module transmission of main control card;
For the arbitrary Agent ID that receives, detect it and whether exist,
If do not exist, be that described Agent ID distributes a memory space, Graceful Restart message that will be corresponding with described Agent ID and the interface ID of described transmission interface are stored in described memory space;
If exist, upgrade Graceful Restart message in described Agent ID corresponding stored space and the interface ID of described transmission interface.
When receiving fault that main control card sends and restart notice, the transmission interface by corresponding interface ID sends to neighbor device to the Graceful Restart proxy module in ply-yarn drill with the Graceful Restart message stored in each memory space.
Preferably, the function interface that utilizes remote procedure call to provide is provided for described message repeating unit, and the interface ID that described each transmission interface is corresponding, Agent ID and Graceful Restart message are sent to the Graceful Restart proxy module in ply-yarn drill.Do not take the data traffic transmission passage, can improve transmitting efficiency.Also can adopt other communication mechanism to send information.
In the present invention, send interface ID corresponding to each transmission interface, Agent ID, Graceful Restart message by the message repeating unit in main control card Graceful Restart proxy module, rather than directly sent by main control card Routing Protocol module, for the route agreement is played shielding, if the communication mechanism of i.e. equipment room transmission information changes, the Graceful Restart proxy module that only needs to change main control card gets final product, and need not to revise the Routing Protocol module.
In the present invention, Agent ID be set be for the interface ID of transmission interface, Graceful Restart message as a whole object, described whole object of an Agent ID sign is convenient to upgrade the interface ID of Graceful Restart message and transmission interface thereof on ply-yarn drill.
As preferred embodiment, described Agent ID can be generated by the application of Agent ID generation unit according to Routing Protocol, and as moving altogether M Routing Protocol on main control card, each protocol application is on N interface; Need to generate M * N Agent ID.Described Agent ID form includes and identifies one to one Routing Protocol numbering territory with Routing Protocol and interface uses sequence number field, and Routing Protocol numbering territory and interface use the data length of sequence number field to be preset.
Preferably, in Agent ID, Routing Protocol numbering and interface use sequence number to encode according to actual needs.For example, if want to represent that more Routing Protocol and interface use sequence number, can adopt binary coding, the form of Agent ID can be as shown in Figure 3, and high 4 bit representation Routing Protocol numberings are used for distinguishing different Routing Protocols, can represent altogether 24 kinds of Routing Protocols, low 28 bit representation interfaces use sequence number, can represent that altogether 228 kinds of interfaces use sequence number, and interface uses the quantity of sequence number identical with the quantity of interface.Also can adopt the various coded systems such as octal system, the decimal system, hexadecimal.
Described Routing Protocol numbering is corresponding one by one with the Routing Protocol sign, for example, the Routing Protocol that moves on distributed network equipment has these two kinds of Routing Protocols of routing protocol IS-IS of open type shortest path priority protocol OSPF, Intermediate System-to-Intermediate System, can in advance the ospf protocol numbering be made as 0, the Intermediate System to Intermediate System numbering is made as 1.
Described according to interface use order-assigned Agent ID, for example, existing 3 interface A, B, C, at first move Routing Protocol X on interface A, the use sequence number of interface A is made as 1, then moves Routing Protocol X on interface C, and the use sequence number of interface C is made as 2, just move at last Routing Protocol X on interface B, the use sequence number of interface B is made as 3.
Preferably, in described main control card, the Routing Protocol module also is used for, and when arbitrary Routing Protocol stops at operation on arbitrary interface, sends Agent ID to the Agent ID generation unit and cancels request;
Described Agent ID generation unit is further used for, and after receiving Agent ID that the Routing Protocol module sends and cancelling request, cancels the corresponding relation between the interface ID of interface use sequence number and described transmission interface in described Agent ID.
For example, 3 interface A, B, C in above-mentioned example, Routing Protocol X successively is applied on interface A, C, B, Routing Protocol X cancelled the application on interface A, C afterwards, at this moment, interface uses sequence number 1,2 no longer with the interface ID of interface A, C, corresponding relation to be arranged, and when Routing Protocol X operates in interface C once more, interface can be used sequence number 1 to distribute to the interface ID of this interface C.For Routing Protocol Y, be also like this.
Preferably, the Routing Protocol module, described regular generation sends to time cycle of Graceful Restart message of this Routing Protocol of neighbor device to preset according to actual needs, for example, can every 3 HELLO cycles, generate one time the Graceful Restart message.
The Graceful Restart message of each transmission interface and interface ID, and the current Routing Protocol that runs on this interface be one to one because distributed network equipment can send multiple Graceful Restart message, different Routing Protocols, the Graceful Restart message of generation is different; Same Routing Protocol operates on different interfaces, and the Graceful Restart message that sends on each interface also may be different, and for example: the source MAC of message is not identical.
In the Graceful Restart proxy module of ply-yarn drill, whether described detection Agent ID exists: Agent ID uses sequence number to consist of by Routing Protocol numbering and interface, in fact Agent ID is exactly a numeral, and whether the numeral of the Agent ID that only need relatively receive get final product identical with already present numeral.If identical numeral is arranged, illustrate that Agent ID exists, if can not find identical numeral, illustrate that Agent ID does not exist.
Graceful Restart message in the described Agent ID corresponding stored of described renewal space and the interface ID of described transmission interface, be the up-to-date Graceful Restart message that on the local storage of each distributed ply-yarn drill main control card, the Graceful Restart proxy module sends, to guarantee the validity of Graceful Restart message.
When main control card breaks down when restarting, main control card can be notified each distributed ply-yarn drill.Each distributed ply-yarn drill gets main control card restart event after, the Agent ID of the local preservation of traversal immediately, Graceful Restart message in extraction Agent ID corresponding stored space and corresponding transmission interface ID, the Graceful Restart message is sent to the neighbor device of this network equipment on transmission interface corresponding to described interface ID, restarts so that notice neighbor device main control card is current.
Just send the Graceful Restart message to neighbor device with respect to being restarted in fault by the Routing Protocol module in prior art after completing, the present invention just sends the Graceful Restart message to neighbor device by ply-yarn drill when fault is restarted generation, can shorten sending the time of Graceful Restart message.Carried the needed time of recovery normal condition of configuration in the Graceful Restart message, utilized this time, the Routing Protocols such as OSPF, IS-IS just can be completed the initial work of the necessity after switching, recover normal condition.After Routing Protocol was restarted, it is synchronous that neighbor device also assists it to carry out information (comprising various topologys, route and session information that the related protocol of supporting Graceful Restart is safeguarded), returns to the normal condition before restarting within the short time of trying one's best.By utilizing the Graceful Restart technology, can not produce route oscillation in the Routing Protocol restarting process, message forwarding path is also without any variation, and whole system can realize the uninterrupted operation of forwarding service.
Preferably, the function interface that provides as the message repeating unit by using RPC of main control card, when the Agent ID that each transmission interface is corresponding, Graceful Restart message, interface ID are forwarded to the Graceful Restart proxy module of ply-yarn drill, the Graceful Restart proxy module of ply-yarn drill utilizes the function interface that RPC provides to receive the information that described Agent ID generation unit sends.
Preferably, be the reliability that guarantees that the Graceful Restart message sends, the Graceful Restart proxy module of described ply-yarn drill sends to the Graceful Restart message of neighbor device with each, can repeatedly send according to the default time interval.For example, each Graceful Restart message can be sent 3 times every minor tick 10 seconds.
The method flow of the embodiment of the present invention guarantees the method for Graceful Restart as shown in Figure 2 in a kind of distributed network equipment, comprise the following steps:
Step 201: the Routing Protocol that moves on main control card regularly produces the Graceful Restart message that sends to neighbor device, sends on each ply-yarn drill by the Graceful Restart proxy module on main control card.
Preferably, the Graceful Restart proxy module on main control card, the function interface that the Graceful Restart message is provided by remote procedure call sends on each ply-yarn drill.
Step 202: the Graceful Restart proxy module on each ply-yarn drill receives the Graceful Restart message from main control card, and preserves current up-to-date Graceful Restart message in this locality.
Step 203: each ply-yarn drill is when receiving the notice that main control card restarts, and the up-to-date Graceful Restart message that the Graceful Restart proxy module on ply-yarn drill is preserved this locality is sent to described neighbor device.
Preferably, the Graceful Restart proxy module on described ply-yarn drill sends to the Graceful Restart message of neighbor device with each, repeatedly sends according to the default time interval.
As preferred embodiment, in step 201, the Graceful Restart proxy module of described main control card sends the Graceful Restart message time each ply-yarn drill, has also sent following information and has arrived each ply-yarn drill, comprise,
Send the interface ID of the interface of Graceful Restart message, and the Routing Protocol of this interface operation is that this interface is to the Agent ID of Graceful Restart proxy module application;
In step 202, the Graceful Restart proxy module in described ply-yarn drill regularly receives corresponding Agent ID, interface ID and the Graceful Restart message of transmission interface of the Graceful Restart proxy module transmission of main control card;
For the arbitrary Agent ID that receives, detect it and whether exist,
If do not exist, be that described Agent ID distributes a memory space, Graceful Restart message that will be corresponding with described Agent ID and the interface ID of described transmission interface are stored in described memory space;
If exist, upgrade Graceful Restart message in described Agent ID corresponding stored space and the interface ID of described transmission interface.
In step 203, the up-to-date Graceful Restart message that the Graceful Restart proxy module on ply-yarn drill is preserved this locality, transmission interface corresponding to interface ID corresponding by this Graceful Restart message is sent to described neighbor device.
The method and apparatus of assurance Graceful Restart provided by the invention can when main control card works, regularly send to the Graceful Restart message on each distributed ply-yarn drill by main control card.When the main control card fault is restarted, each distributed ply-yarn drill need not to wait for that main control card is restarted completes and Routing Protocol operation, directly the Graceful Restart message with backup sends to neighbor device, has shortened the interval time that the Graceful Restart message sends, and has improved the success rate of Graceful Restart.
The above is only preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (10)
1. a method that guarantees Graceful Restart, be applied on distributed network equipment, and the described network equipment comprises main control card and at least one ply-yarn drill, it is characterized in that, comprises the following steps:
A. the Routing Protocol that moves on main control card regularly produces the Graceful Restart message that sends to neighbor device, sends on each ply-yarn drill by the Graceful Restart proxy module on main control card;
B. the Graceful Restart proxy module on each ply-yarn drill receives the Graceful Restart message from main control card, and preserves current up-to-date Graceful Restart message in this locality;
C. each ply-yarn drill is when receiving the notice that main control card restarts, and the up-to-date Graceful Restart message that the Graceful Restart proxy module on ply-yarn drill is preserved this locality is sent to described neighbor device.
2. method according to claim 1, is characterized in that, in steps A, and the Graceful Restart proxy module on main control card, the function interface that the Graceful Restart message is provided by remote procedure call sends on each ply-yarn drill.
3. method according to claim 1 and 2, is characterized in that, in steps A, the Graceful Restart proxy module of described main control card sends the Graceful Restart message time each ply-yarn drill, has also sent following information and has arrived each ply-yarn drill, comprise,
Send the interface ID of the interface of Graceful Restart message, and the Routing Protocol of this interface operation is that this interface is to the Agent ID of Graceful Restart proxy module application.
4. method according to claim 3, is characterized in that, step B comprises:
Graceful Restart proxy module in described ply-yarn drill regularly receives corresponding Agent ID, interface ID and the Graceful Restart message of transmission interface of the Graceful Restart proxy module transmission of main control card;
For the arbitrary Agent ID that receives, detect it and whether exist,
If do not exist, be that described Agent ID distributes a memory space, Graceful Restart message that will be corresponding with described Agent ID and the interface ID of described transmission interface are stored in described memory space;
If exist, upgrade Graceful Restart message in described Agent ID corresponding stored space and the interface ID of described transmission interface.
5. method according to claim 3, it is characterized in that, in step C, the up-to-date Graceful Restart message that the Graceful Restart proxy module on ply-yarn drill is preserved this locality, transmission interface corresponding to interface ID corresponding by this Graceful Restart message is sent to described neighbor device.
6. method according to claim 1, is characterized in that, in step C, the Graceful Restart proxy module on described ply-yarn drill sends to the Graceful Restart message of neighbor device with each, repeatedly sends according to the default time interval.
7. equipment that guarantees Graceful Restart comprises: include main control card and at least one ply-yarn drill of at least one Routing Protocol module, it is characterized in that, described main control card also comprises the Graceful Restart proxy module, and described ply-yarn drill also comprises the Graceful Restart proxy module,
At least one Routing Protocol module of described main control card is used for the Graceful Restart message that regularly generation sends to this Routing Protocol of neighbor device;
Graceful Restart proxy module in described main control card is used for the Graceful Restart message that each Routing Protocol module produces is sent to the Graceful Restart proxy module of each ply-yarn drill;
Graceful Restart proxy module in described ply-yarn drill is used for receiving the Graceful Restart message from main control card, and preserves current up-to-date Graceful Restart message in this locality; And be used for when the place ply-yarn drill receives the notice that main control card restarts, the up-to-date Graceful Restart message of this locality preservation is sent to described neighbor device.
8. equipment according to claim 7, is characterized in that, the Graceful Restart proxy module in described main control card comprises:
The Agent ID generation unit be used for to receive that on main control card, arbitrary Routing Protocol module is the request of the total interface application assignment agent ID of this Routing Protocol of operation, and returns to the Agent ID that distributes to corresponding Routing Protocol module; The request of described application assignment agent ID has comprised the interface ID that moves this Routing Protocol;
The message repeating unit is used for the regular Graceful Restart message that produces of arbitrary Routing Protocol module of main control card is sent to the Graceful Restart proxy module of described ply-yarn drill; The Agent ID that also has corresponding transmission interface and the interface ID that send simultaneously with the Graceful Restart message.
9. equipment according to claim 8, is characterized in that, comprising: the Graceful Restart proxy module in described ply-yarn drill is used for, and regularly receives corresponding Agent ID, interface ID and the Graceful Restart message of transmission interface of the Graceful Restart proxy module transmission of main control card;
For the arbitrary Agent ID that receives, detect it and whether exist,
If do not exist, be that described Agent ID distributes a memory space, Graceful Restart message that will be corresponding with described Agent ID and the interface ID of described transmission interface are stored in described memory space;
If exist, upgrade Graceful Restart message in described Agent ID corresponding stored space and the interface ID of described transmission interface.
10. equipment according to claim 8, it is characterized in that, described message repeating unit is for the function interface that utilizes remote procedure call to provide, and the interface ID that described each transmission interface is corresponding, Agent ID and Graceful Restart message are sent to the Graceful Restart proxy module in ply-yarn drill.
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| CN103166847B (en) | 2016-03-09 |
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